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June 21 1927. J. SHAW MANUFACTURE OF PAPER PULP BOTTLES AND THE LIKEFiled June 24, 1926 Fig. 2

- JaaS fi/aw W Patented June 21, 1921.

UNITED STATES. PATENT OFFICE.

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' HANUI'A CTURE 01' PAIEB-PULP BOTTLES AND THE nnm.

' Applicationflled June 24, 1988. Serlai No. 118,152.

This invention relates to improvements in methods and means for.manufacturing paper pulp milk bottles and the like, which haverestricted neck or mouth openings 6 which renders the use of solid 'andnon-disintegrating which has heretofore prevented the manufacture ofsuch bottles in a commercially practicable manner.

The principal bject of my invention therefore is to provide a specialform of core for use in the-manufacture of such bottles, a means formaking the core and a means 'for making the bottle in connection withthe core which enables the use of a solid mold for the bottle andrenders it an easy matter to pour or force the pulp into the'mold' inorder for said bottle forming s Generally my improvement in themanufacture of these bottles-contemplates the use of a core of ice whichis allowed to melt when it has served its purpose and which is made andmounted inthe bottle mold, as

hereinafter seen.

A further object of the invention is to 1 produce a simple andinexpensive device and yet one which will be exceedin ly efiective forthe purpose for which it is esigned.

These ob ects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

In the drawings sim'lar characters of reference indicate correspondingpartsin the several views:

. Fig. 1 is a sectional elevation of a milk bottle core-mold.

Fi 2 is a similar view of the bottle mold 40 showing the core mounted inthe mold.

Fig. 3 is a fragmentary bottom plan view of the bottle mold cap.

Fig. 4 is a fragmentary cross section of the mold.

Referring now more particularly to the characters of reference on thedrawings the numeral 1 denotes a flat supporting element having anupstanding circular flange 2 to removably receive and locate the lowerend of the core mold 3. This mold is made of a suitable metal orothermaterial having high heat conductlng properties.

cores impossible-a feature.

plulp to assume the proper;

The mold has a longitudinal opening 4in the form of an inverted milkbottle, the portion of said opening which corresponds to the sides ofthe milk bottle having a slight diverging slope towards its upper end sothat the core when formed can be readily withdrawn from the mold whenthe latter is inverted.

A cap 5 is mounted for. vertical adjustment on the top of the mold andextends downwardly into the same a certain distance; The bottom of thecap has an outline corresponding to. that desired for. the interior ofthe bottom of the bottle to be .formed and is so located relative to theopening 4 that the enclosed chamber thus formed in the mold is equal'insize and shape to that of the interior of a standard milk bottle ofcertain capacity.- 7 f The ca has a number of vertical and small ori ces6 therethrough so that air can escape from the chamber when the waterenters the same at the opposite end.

Mounted on the sup ort 1 centrally of the mold is a hollow cone pipe 8pro'ecting upwardly from below. the sup ort. llS cone is centralizedrelat1ve to t e. lower end of the mold opening and projects upwardlyinto the same a certain distance. The cone has a plurality of onfices 9leading from the pipe to the interior of the mold area. 1

To form the core the operations are preferably carried out in a room inwhich the tem erature is maintained as low as 1s pracconnected to awatertica 1e and very cold water is allowed to enter the mold from the pipe 8in such ner as notto fill the mold chamber to top but only to a certainlevel, as at The proper volume of the waterls ca culated so that whenexpansion due to freezing, takes place, the ice williill the entirechamber and will take the shape of the surrounding mold walls, as wellas that of the bottom of the cap 5. After the'water been poured into themold and frozen cap is removed from the mold and the latter is invertedso that the core may shde'out.

a manthe The core 10 is then a solid piece of ice with a cone-shapedsocket at one and correspondin to the cone 7. For making the bottle Iprovide a vertical mold 11 arranged to be removably located on a flatsupporting element 12 by means of an upstanding continuous flange 13thereon. The mold has a longitudinally extending opening 14 therein,tapered toward its upper end to correspond to the taper of the core. Atthe upper end of said opening a hollow cap 15 is fitted onto the mold.The chamber in the mold thus formed by the side walls a and the cap andextending between said cap and the lower end of the mold is symmetricalto the core 10 but larger, being of a size equal to the exterior contourof the bottle to be formed. The cap 15 has a plurality of smallconcentric grooves 16 in its lowerfa ce, from which grooves small holes17 lead into the enclosed chamber 18 formed in the cap.

Mounted on'the support 13 centrally of the mold is a circul-anflangemember 19 whose diameter is-intermediate the exterior and interiordiameter of the bottle at the mouth, and which projects somewhat abovethelevel of the support 13 on which the mold rests. Projecting upwardlyand centrally from said flange is a cone 20, exactl the same size as thecone 7 of the core mol The cone and flange are connected to a pipe 21through which the pulp is fed from a suitable source of supply, radialholes 22 leading from the pipe to the rim of the flan e. The opening 14in the bottle mold,

pre erably has a large number of small vertical grooves down its sidesfrom the cap 15 to the bottom of the mold, said grooves being shown inexaggerated form at 23 in e 4. In operation the core having been ma thecap 15 of the bottle mold is removed and the core 10 is inserted. l

The socket in the core fits over the cone 20 so that the core iscentrally located in the mold 11 relative to the opening 14 and ofcourse is spaced from the'sides of said opening as well as from a .cap15 a certain distance. A space all around the core is therefore formedin the bottle mold, the width of thisspace determining the thickness ofthe bottle. Pulp of a suitable character and also maintained at a lowtem rature' is then forced u wardly through the pipe 21 and into saidspace through the openings 22 tocform the bottle 24. The air displacedfrom the mold space with the advancing pulp passes into the chamber 18of the cap, being there compressed to a certain extent. The pressure onthe incoming pulp being greater than that of this confined air, waterfrom the pulp is also forced into the chamber 18. The pulp being of afibrous nature will not however pass through the small holes 17 norlodge in the grooves 16,

but will lie. across the same. The result is that the majority of thewater in the pulp mixture will be immediately drained ro the same,leaving the pulp in the mold-space in a firm condition.

Should the holes 17 lend to become clogged, an intermittentslackening-up action on the pulp pressure will cause the air pressure toact to blow through and unclog the holes, as will be evident.

The grooves 16 aid in carrying oil the water from the pulp into theholes 17 while the vertical grooves 23 (which are arranged to connectwith the outermost groove 16) drain the water from the sides of thebottle, these grooves beingso small that the pulp will merely lie acrossthe same. Owing to the flange 19, when the bottle is formed a circulardepression around the inside of the mouth of the bottle will be providedto receive the usual cover cap.

When the bottle has been completely poured the mold is removed from thesupport and inverted. The water in the cap will then drop to the bottomof the chamber 18, and the cap is then removed. The mold is then placedin a warm room so that the core will melt and flow out, when the bottlemay be withdrawn from the mold. From the foregoin description it will bereadily seen that I ave pfirfiduced such a device as substantially fu sthe objects of the invention asset forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to .as do not form a departure from the spirit ofthe invention, as defined by the ap nded claims.

Having thus descri d my invention what I claim as new and useful anddesire to secure by Letters Patent is:

1. A method of making a paper pulp vessel in a mold consisting inplacing in the mold chamber, a core made .of ice, pouring the pulp intothe mold around the core, and allowing the core to melt.

2. In combination, a mold having an interior chamber whose area andshape is that of the interior of a vessel to be made, and an ice core tofit in 'said'chamber in spaced relation to the walls thereof.

'3. In combination, a mold having an interior chamber whose area andshape is that mold consisting in lacing in the mold chamber, a core made0 a solid but meltable substance, pouring the pulp into the mold owingthe core and means for introducing pulp into the space between the coreand mold at the bot- 5. ln eo1nbination,a vertical mold having tom ofthe latter, the inner walls of the a longitudinal chamber open on itsupper mold having longitudinal grooves leading 5 end, a cap having aplurality of perforafrom the bottomtothe cap.

tions therethrongh to fit in the top of the In testimony whereof I afiixmy signature.

mold, a core to fit in the mold chamber in spaced relation to theside-walls and cap, JAMES SHAW.

around the core, and then all lo melt.

